
A 10.0-g sample of silicon contains _____ silicon atoms? O a) 6.02 x 1023 O b)...
moles of C. 6) 0.400 mole of sucrose, C12H22011. contains A) 12 B) 6.02 x 1023 C) 5.02 x 1022 D) 2.89 x 1024 E) 4.80 7) How many moles of carbon atoms are there in 0.500 mole of C2H6? A) 0.500 mole B) 1.00 mole C) 3.00 moles D) 6.02 x 1023 moles E) 4.00 moles 8) Calculate the molar mass of magnesium chloride, Mg (12. A) 24.31 g/mole B) 95.21 g/mole C) 125.9 g/mole D) 59.76 g/mole E)...
1. 24.8 g of oxygen contains a. 9.33 x 1023 oxygen atoms b. 50 amu c. none of these d. 1.49 x 1025 oxygen molecules e. 1.55 mol of oxygen molecules 2. 1.2 moles of oxygen atoms represent a. 0.4 g b. 0.72 x 1024 atoms c. 1.9 x 101 atoms d. 1.0 x 102 g e. none of these
3) Calculate the percentage by mass of hydrogen in PtCl2(NH3)2 A) 0.672 B) 2.016 C) 1.008 D) 0.034 E) 1.558 4) How many molecules of CH4 are in 48.2 g of this compound? A) 1.81 x 1024 B) 4.00 C) 2.00 x 1023 D) 4.64 x 1026 E) 5.00 x 10-24 5) A sample of CH2F2 with a mass of 19 g contains A) 9.5 B) 3.3 * 1024 C) 2.2 x 1023 atoms of F. D) 4.4 x 1023...
How many carbon atoms are in 8.44 mL of C3H6O? 1 mole = 6.02 x 1023 atoms 1 mL = 0.898 g The answer has to be in the correct significant figures. Not sure how to do this.
1.93 1026 atoms Question 19 (1 point) What is the mass of 12.04 1023 atoms of O? 0 8.0g O 16g 0 32 g O 17 g Onone of these Question 20 (1 point) What is the mass in grams of 557 copper atoms? 1.46 10-23 g of Cu 5.88 10-20 g of Cu 3.54 104 g of Cu 5.28 1024 g of Cu ID 2.13 1028 g of Cu none of these Question 20 (1 point) What is the...
1. One mole of sodium atoms contains: a) 23 atoms b) 6.022 x 1023 grams c) 6.022 x 1023 atoms d) 60.22 x 1023 atoms
45) How many iron atoms are present in 0.552 mol of iron? A) 27.98 y old sobilo B) 2.798 x 1024 bolsoba C) 55.85 D) 6.02 x 1023 E) 3.32 x 1023
2. Which of these quantities does not represent 1.00 mol of the indicated substance? a. 6.02 x 1023 C atoms b. 55.85 g Fe c. 12.01 g C d. 15.4 g Zn e. 6.02 x 1023 Fe atoms 3. If 0.274 moles of a substance weighs 6.66 g, what is the molar mass of the substance, in units g/mol? a. 2.28 x 102 g/mol b. 1.71 x 10 g/mol c. 4.38 x 103 g/mol d. 2.17 x 10 g/mol e....
m105%20Makeup%20Exam%20(2).pdf 31) 31) To convert a given number of moles into the number of atoms, one would multiply by which of the following factors? A) 1.66 x 10-24 atoms/I mol B) 1 mol/6.022 1023 atoms C) molar mass D) 6.022 * 1023 atoms/1 mol E) 1 mol/1.66 x 10-24 atoms 3 2) 32) How many atoms of sulfur are present in a 155 g sample of sulfur? [Molar mass: S 32.06 g/mol) A) 6.02 x 1023 atoms B) 2.91 x...
How many atoms or ions of each element are in 151.1 g of the following substances? (a) H2 x 1025 H atoms (b) Ca(NO3)2 * 1023 Ca2+ ions x 1024 NO3 ions (C) N202 x 1024 N atoms * 1024 O atoms (d) K2SO4 * 1024 K+ ions * 1023 s042-ions